JLG 26MRT Service & Maintenance page 47

TROUBLE
Platform raises and lowers erratically
Platform drifts down
High Drive does not operate below horizontal
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Table 3-1. Elevation System Troubleshooting
PROBABLE CAUSE
Hydraulic system oil low.
Restricted or broken hydraulic line or fit-
ting.
Counterbalance valve on lift cyl. improp-
rely adjusted or not functioning properly.
Control valve not functioning properly.
Worn seals in lift cylinder.
Lift cylinder not functioning properly.
Manual lowering valve not functioning
properly.
Worn seals in lift cylinder.
Holding valve on lift cylinder not function-
ing properly.
Damaged wiring on limit switch.
Damaged limit switch.
– JLG Sizzor –
SECTION 3 - TROUBLESHOOTING
REMEDY
Replenish oil as necessary.
Clean, repair or replace line.
Replace valve.
Repair or replace valve.
Replace seals.
Repair or replace lift cylinder.
Repair or replace valve.
Replace seals.
Repair or replace valve.
Repair or replace wiring.
Replace limit switch
3-3